gr-filter : Eliminate memory leak in pm_remez.cc

Addresses Coverity issue 1046179.

Signed-off-by: Philip Balister <philip@balister.org>
gr-filter : Fix memory leaks in pm_remez.cc.

Addresses Coverity issues 1046146, 1046277, 1046375, 1046292, 1046282,
1046388, 1046097, 1046381, 1046149.

Signed-off-by: Philip Balister <philip@balister.org>